Rescue crews transported the man to Boston Medical Center, where he was pronounced dead, police said. Authorities did not immediately identify the man.

Aileen Derocher
, 64, who lives in a three-decker near the shooting scene, said she heard three pops and shouting about midnight. “I thought it was a car backfiring until I heard this woman screaming,” Derocher said Sunday.

The shooting occurred in the city’s so-called Polish Triangle. Several residents said Sunday night that it is generally a quiet neighborhood, aside from the sounds of traffic zipping by on Boston Street, a busy cut-through between Dorchester and South Boston.

Apartment buildings line the roadway next to a few squat industrial buildings and a Polish-American market. Derocher said she has lived in the neighborhood for about 20 years without experiencing any significant violence.

Homicide detectives are investigating and ask anyone with information to call 617-343-4470. To report a tip anonymously, call 1-800-494-8477 or text “TIP” to CRIME (27463).